Siemens SIMATIC ET 200AL System Manual page 351

Interrupts/diagnostic alarms
5.1 Status and error displays
Meaning of the LEDs
The following tables set out the meaning of the status and error displays. Remedial
measures for diagnostic alarms can be found in the section Diagnostics alarms (Page 21).
DIAG LED
Table 5- 1
LED channel status
Table 5- 2
LED channel status
PWR LED
Table 5- 3
20
Error display of the DIAG LED
DIAG LED Meaning
No supply voltage 1L+
Off
Module parameters not assigned
•
Flashes Loading firmware
•
(while the firmware update is being performed, all LEDs retain their cur-
rent status)
Module parameters assigned and no module diagnostics
On
Module parameters assigned and module diagnostics
Flashes
LED channel status display
Meaning
Process signal = 0
Off
Process signal = 1
On
Status display of the PWR LED
PWR LED Meaning
Load voltage 2L+ is missing or too low
Off
Load voltage 2L+ present
On
Digital input/digital output module DIQ 4+DQ 4x24VDC/0.5A 4xM12 (6ES7143-5AF00-0BA0)
Manual, 02/2016, A5E36683613-AA